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belle
- Cut Triangles into Rectangles & Dudeney's Puzzle Generalized
- Berliner Bogen
- Programme de construction d'un triangle
- Mandala...goniometrico!
- Goniometria in tweed
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belle
applet belle ma non utilizzabili nel mio percorso didattico
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1. Cut Triangles into Rectangles & Dudeney's Puzzle Generalized
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2. Berliner Bogen
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3. Programme de construction d'un triangle
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4. Mandala...goniometrico!
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5. Goniometria in tweed
Cut Triangles into Rectangles & Dudeney's Puzzle Generalized
A quadrilateral can be dissected into a rectangle by a line joining the mid-points of one pair of opposite sides, and the perpendiculars to this line from the mid-points of the other pair of opposite sides (see https://www.geogebra.org/student/m3459 ).
In this applet, a triangle is dissected into 4 pieces by the 3 lines.
Rotate the dissections, drag the red points to get a rectangle.
CLICK any black SEGMENT to show/hide its LENGTH.
Drag the Q to investigate its position at which the rectangle becomes a square (the generalized Dudeney's Puzzle).
Anthony Or. GeoGebra Institute of Hong Kong.
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